In November 2015, when islamic terrorists attacked Paris, France declared war on the islamic State. But that war, and France's year of terror, began a year earlier with the attack on satirical magazine Charlie Hebdo.

With access to the French authorities and previously unseen footage, five-time Bafta-winning director Dan Reed reveals the untold story of the massacre and of the first Islamic State strike in Paris at a kosher grocery store.

Key witnesses, police officers and survivors, many speaking for the first time, piece together the dramatic attacks and the unprecedented manhunt that gripped France for 3 terrifying days.